The figures I found were 2650 psi for the 4jb1, and 2133 psi for the 4jg2 idi engine, the 4jg2 figure comes from the owners handbook, but I don't remember where I got the 4jb1 figure from. Personally, I'd ring another injection shop to see if they have the correct pressures.
Edit: I found another source of information, here's a link-
https://manuals-free.com/uploads/files/ ... r_4jb1.pdfThis is for the 5 hole nozzles, 1st stage injector opening pressure 19.5 mpa (2683 psi), 2nd stage 26.5 mpa (3843 psi). I don't know if your engine has the same specs.